On Thursday, September 6 stores all over the world will open their doors to celebrate one of the BIGGEST nights in fashion by letting shoppers get their groove on all night long. One of the best parts, though, are those KILLER celeb appearances. I meannn, Justin Bieber and Rihanna (!!!) will totally be partaking in the festivities. YUS. And, hey, not only do you get to have a total blast, but you're also helping out a great cause. WE LIKE THAT. But seriously, you need to watch this video before we go on any longer because literally EVERYONE is in it. Like, we lost count after 5. (Don't judge us.) How many designers, celebs and artists can you spot? Tell us in the comments below!